You have several ways to do so:
1.- A direct redefinition of \section:
\makeatletter \renewcommand\section{\@startsection{section}{1}{\z@}% {-3.5ex \@plus -1ex \@minus -.2ex}% {2.3ex \@plus.2ex}% {\normalfont\large\bfseries}} \makeatother
2.- By means of the titlesec package:
\usepackage{titlesec} \titleformat{\section}{\large\bfseries}{\thesection}{1em}{}
3.- By means of the sectsty package:
\usepackage{sectsty} \sectionfont{\large}
Now, I would explain the titlesec package a bit more (because it seems easier to me and with more options) :
To change the section fonts with this package put the following lines in the preamble -
\usepackage{titlesec}
\titleformat{\section}{\large\bfseries}{\thesection}{1em}{}
Options available are-
a> Font size -
\normalsize \large \Large \huge \Huge
Increasing size ->
b> Font type-
\bfseries - Bold
\itshape - Italic
c> Headers -
\section
\subsection
\subsubsection
For e.g. to create a subsection with large font in italics write -
\titleformat{\subsection}{\itshape\large}{\thesubsection}{1em}{}
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